Arvind Kejriwal's decision to cut in power tariff in Delhi has inspired Congress MP Sanjay Nirupam to threaten an agitation against the government of his own party in Maharashtra if a similar reduction is not effected in Mumbai.

One of the biggest challenges for the newly-appointed Delhi Chief Minister Arvind Kejriwal is reducing electricity tariffs by 50 per cent, which can be achieved only through cash subsidy from the government, say experts.

Worried about the grim power situation in Andhra Pradesh following a cut in the gas supply by the centre's Empowered Group of Ministers (EGoM), Andhra Pradesh Chief Minister N Kiran Kumar Reddy will be in Delhi on Monday to discuss the issue with Prime Minister Manmohan Singh.

In the small hours of last night, huge parts of North India were plunged in darkness as the Northern Grid collapsed. Many people in eight states have spent the night and much of the morning without electricity. It has affected trains, metro services in Delhi and water supply across the states.

State-run power generating company National Thermal Power Corporation (NTPC) has warned that power supply to Anil Ambani group's distribution companies in Delhi - BSES Rajdhani and BSES Yamuna - would be stopped if they do not clear dues of over Rs 900 crore.